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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended
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Apr. 24, 2012 | Mar. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2011 | Apr. 24, 2012 Maximum [Member] | Dec. 31, 2010 Acquisition of Omneon [Member] | Dec. 31, 2012 Omneon [Member] | Sep. 15, 2010 Omneon [Member] | Jul. 31, 2012 Series A Participating Preferred Stock [Member] | Feb. 19, 2013 Common Stock [Member] Subsequent Event [Member] | Jan. 28, 2013 Common Stock [Member] Subsequent Event [Member] | Dec. 31, 2010 Common Stock [Member] Acquisition of Omneon [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized |  |  | 5,000,000 |  | 5,000,000 |  |  |  |  | 100,000 |  |  |
Stockholder rights plan, period |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Stockholder rights plan, expiry date |  |  | July 2012 |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 14,150,122
Purchase price paid as common stocks |  |  |  |  |  |  | $ 2,125,000 | $ 2,100,000 |  |  |  |  | $ 95,900,000
Cash deposited to secure post-closing indemnification obligations of holders |  |  |  |  |  |  |  |  | 21,000,000 |  |  |  |
Number of common stock deposited to secure post-closing indemnification obligations of holders |  |  | 1,926,920 | 1,926,920 |  |  |  |  |  |  |  |  |
Claim for reimbursement received from escrow |  | 800,000 |  |  |  |  |  |  |  |  |  |  |
Reimbursement received from escrow common stock shares |  | 40,372 |  |  |  |  |  |  |  |  |  |  |
Reimbursement received from escrow common stock value |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Reimbursement received from escrow in cash |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Authorized stock repurchase value | 25,000,000 |  | 135,000,000 |  |  |  |  |  |  |  |  |  |
Maximum period under stock repurchase program |  |  |  |  |  | 18 months |  |  |  |  |  |  |
Common stock repurchased and retired, shares |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |
Common stock repurchased and retired, per shares value |  |  | $ 4.43 |  |  |  |  |  |  |  |  |  |
Common stock repurchased and retired, aggregate value |  |  | 22,600,000 |  |  |  |  |  |  |  |  |  |
Common stock repurchase program, authorized amount remaining |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |
Increase in stock repurchase program |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 | $ 75,000,000 |
Common stock repurchases program expire date |  |  | July, 2014 |  |  |  |  |  |  |  |  |  |

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